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• Ast-Aur
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• Act of Chapultepec - The Columbia Encyclopedia, Sixth Edition
• act of Congress - World Encyclopedia
• Act of God - West's Encyclopedia of American Law
• act of hostility - The Oxford Essential Dictionary of the U.S. Military
• act of Parliament - World Encyclopedia
• Act of Union - World Encyclopedia
• Act of Union - A Dictionary of World History
• Act of Union - The Columbia Encyclopedia, Sixth Edition
• act of war - The Oxford Essential Dictionary of the U.S. Military
• act tune - The Concise Oxford Dictionary of Music
• ACT UP - Dictionary of American History
• Actópan - Concise Dictionary of World Place-Names
• act, human - The Concise Oxford Dictionary of the Christian Church
• Act-Drop - The Concise Oxford Companion to the Theatre
• Act-Tunes - The Concise Oxford Companion to the Theatre
• act. - The Oxford Dictionary of Abbreviations
• Acta Apostolicae Sedis - The Concise Oxford Dictionary of the Christian Church
• actable - Oxford Dictionary of Rhymes
• Actaeon - Oxford Dictionary of Rhymes
• ACTC - The Oxford Dictionary of Abbreviations
• Actes and Monuments - The Oxford Dictionary of Phrase and Fable
• Actes and Monuments of These Latter Perillous Dayes, Touching Matters of the Church - The Concise Oxford Companion to English Literature
• actg - The Oxford Dictionary of Abbreviations
• ACTH - The Oxford Dictionary of Abbreviations
• ACTH - A Dictionary of Food and Nutrition
• ACTH - A Dictionary of Biology
• ACTH - A Dictionary of Nursing
• ACTH - A Dictionary of Zoology
• ACTH - The Columbia Encyclopedia, Sixth Edition
• Actilight - A Dictionary of Food and Nutrition
• Actimel - A Dictionary of Food and Nutrition
• actin - A Dictionary of Nursing
• actin - A Dictionary of Zoology
• Acting Company - The Concise Oxford Companion to the Theatre
• Acting Company, The - The Oxford Companion to American Theatre
• Acting Out - Gale Encyclopedia of Children's Health: Infancy through Adolescence
• acting pilot officer - The Oxford Essential Dictionary of the U.S. Military
• acting rank - The Oxford Essential Dictionary of the U.S. Military
• Actiniaria - A Dictionary of Zoology
• actinic - Oxford Dictionary of Rhymes
• Actinides - Chemistry: Foundations and Applications
• Actinides - Science of Everyday Things
• Actinistia - A Dictionary of Zoology
• Actinium - Chemistry: Foundations and Applications
• actinium - Oxford Dictionary of Rhymes
• Actinium (revised) - Chemical Elements: From Carbon to Krypton
• actinium series - A Dictionary of Earth Sciences
• actinium series - A Dictionary of Ecology
• actino- - A Dictionary of Ecology
• actino- - A Dictionary of Plant Sciences
• Actinobacteria - A Dictionary of Biology
• Actinoceratida - A Dictionary of Zoology
• actinolite - A Dictionary of Earth Sciences
• actinolite - The Columbia Encyclopedia, Sixth Edition
• actinomorphic - A Dictionary of Ecology
• actinomorphic - A Dictionary of Plant Sciences
• actinomorphic - The Oxford Pocket Dictionary of Current English
• actinomorphy - A Dictionary of Biology
• Actinomyces - World of Microbiology and Immunology
• Actinomyces - A Dictionary of Nursing
• Actinomycetales - A Dictionary of Plant Sciences
• actinomycete - A Dictionary of Ecology
• actinomycete - A Dictionary of Plant Sciences
• Actinomycetes - A Dictionary of Biology
• actinomycin - The Columbia Encyclopedia, Sixth Edition
• actinomycin D - A Dictionary of Nursing
• actinomycosis - A Dictionary of Nursing
• actinon - The Columbia Encyclopedia, Sixth Edition
• Actinopodea - A Dictionary of Zoology
• Actinopodidae - A Dictionary of Zoology
• Actinopterygii - A Dictionary of Earth Sciences
• Actinopterygii - A Dictionary of Zoology
• actinorrhiza - A Dictionary of Ecology
• actinorrhiza - A Dictionary of Plant Sciences
• actinostele - A Dictionary of Plant Sciences

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